Abstract
We have studied the effect of thermal treatment of tin dioxide (water content, specific area, Brönstedt acidity.) According to published data and our results, the Brönstedt acidity of this hydrous oxide may be attributed to the surface hydroxyl groups. We have followed the retention of divalent transition elements by a tracer technique. In accordance with an ion-exchange model a thermodynamic study has been made and we have established that divalent ions exchange with part of the acidic protons in a reversible equilibrium, with stoichiometry 1M2+:1H+. The thermodynamic constants of this exchange follow the order of stabilities of the M2+-O-bonds. A study of the solid before and after the retention of the divalent ions has been conducted by ESCA and TGA. Our observations are in agreement with an M2+O- bond and the divalent elements are retained in solvated form. It seems that the ion-exchange model fits the retention of divalent ions on tin dioxide.
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